#!/usr/bin/env python
#coding=utf-8
#author=xiaomayi0323
#date=2009/02/27
#filename=2-8d

#使用用户输入值和For循环实现计算五个数值的和
a = 0

for i in range(5):
    a = a + int(raw_input('enter number:'))
    
print a